Smoke a room with mugwort leaves. Take a room with a square meter of 12 as an example. You must close the doors and windows, put 500 grams of pure mugwort leaves in a metal basin, and light it in the room for about 1 hour. Tender mugwort leaves can't be used when smoking, because the medicine is not strong enough, so it must be smoked slowly, and people must leave the room when smoking.